393 



G. G. SCOTT. 



(D) RELATION OF REGENERATION TO FOOD. 

 It will be remembered that fishes in Series A, B and C were 

 not fed while those in Series D, E and F were fed. Otherwise 

 as far as known they were kept under identical conditions and 

 for the same length of time. It was desired to compare regene- 

 ration in the two series with each other to ascertain whether 

 regeneration is at a greater rate in the fed fishes than in the not- 

 fed. Unfortunately we cannot make use of Series E because as 

 before said some factor has entered there and caused a result 

 which I do not believe to be normal. On the other hand I do 

 regard Series D and F as normal. Therefore we must compare 

 regeneration in D with that in A. 



In this case the mean difference in regeneration is more than 

 three times the probable difference. In other words the fishes 

 in Lot D which were fed have regenerated more in the same 

 time than the fishes in Lot A which were not fed. 



In this case also the mean difference in regeneration between 

 F and B is more than three times the probable difference. Or 

 the fishes in Lot F which were. fed have regenerated more than 

 the fishes in Lot B which were not fed. 



We may compare the average specific regeneration of the cau- 

 dal in the case of the fishes that were fed with that in the fishes 

 that were not fed in the following way also. 



Average Sp. Reg. in caudal of Lots D -f F (fed) ............................. =0.10100 



Average Sp. Reg. in caudal of Lots A -f- B -f- C (not fed) ....... , ........... ;-:O. 



Difference .............................................................. ==0.01535 



The caudal fin in fishes that were fed regenerated 18 per cent. 

 more than that in fishes not fed. 

 Again, 



Average Sp. Reg. in pectoral fin in Lot F (fed) ................................. ~ 0.0866 



Average Sp. Reg. in pectoral fin in Lot B -f C (not fed) ...................... 1=0.0677 



I )i fference ............................................................... -0.0189 



